Fisher® D4

Body Content 1

Fisher® D4 control valve is a compact, rugged globe valve designed primarily for high-pressure throttling applications. This valve is ideal for use on pressure and flow control applications within the oil and gas production industry. The D4 is an excellent control valve for high-pressure separators, scrubbers, and other processing equipment. These valves are especially useful for either throttling or on/off control of liquids or gases which are gritty, sticky, or which have a tendency to build up on internal valve parts. The trim and packing can be maintained by removing the patented deep-bore hammer nut and lifting the actuator/bonnet assembly off the valve without disassembling the actuator. The unique D4 design provides additional protection if disassembly of bonnet/valve body connection is started while there is still pressure in the valve body. Pins mounted in the valve bonnet help ensure the bonnet disengages from the valve body as the hammer nut is removed, while the threads are still engaged.

Safer Bonnet / Valve Body Connection– Unique design provides additional protection if disassembly of bonnet/valve body connection is inadvertently started while there is still pressure in the valve body. Pins mounted in the valve bonnet help ensure the bonnet disengages from the valve body as the hammer nut is removed, while the threads are still engaged.

Live-loaded Packing System–The packing system provides an improved stem seal to help prevent the loss of valuable or hazardous process fluids or gases. It features Fisher ENVIRO-SEALt packing technology to provide reduced packing maintenance.

Electric and Pneumatic

NACE Constructions–NACE compatible trim is available with the D4 control valve. These constructions meet the metallurgical requirements of NACE MR0175 / ISO 15156.

Severe Service Capability with Tungsten Carbide Trim–D4 valves are available with tungsten carbide trim for erosive service. This trim is designed specifically for severe service applications in the oil and gas industry. Durable tungsten carbide trim may benefit your application by wearing better and lasting longer.

Easy Maintenance–Hammer nut bonnet/body joint allows repair or maintenance with a minimum of tools, without removing the valve body from the piping system. Seat ring can be removed with the same service tools used with a Fisher D valve.

Integral Bonnet Flange– Bonnet has an integral flange that accepts hammer nut force when making the bonnet-to-body connection. There are no snap rings subject to possible failure in sour service or in atmospheric corrosion.

Standard Trim for Throttling or On-Off Service– Micro-Form trim is standard for throttling or on-off service at no extra cost.

Application Flexibility–Choices of port diameters up to 31.8 mm (1.25 inches), end connections, and trim materials suit these valves to many applications, including sour service.

Electric

Low Power Consumption-- The Fisher easy-Drive electric actuator operates with 12 or 24VDC and less than 0.1 watt hours per operation, using Modbus, 4-20 mA, 1-5VDC, or dry contact control signals.

Low Temperature-- The easy-Drive electric actuator design allow use in ambient temperatures as low as -20°C (-4°F) without use of a heater.